Jun 12, 2019

I pondered what 2d10 + the absolute difference between the two of them would be. After thinking though a few of the rolls, I realized that 3 isn't a possible outcome. The lowest roll would be 2, at a 1% chance (two back to back 10% chances). The max roll was from either 10 10 or 1 10.

Turns out, it is really similar to having advantage in DnD 5e, aka Higher 1 of 2d20 (image is the same graph as above, with "at most" selected). If on the advantage though, you "rounded up" odds to evens, it is the same.
I had hoped that this would have resulted in an upper bell curve, seen below in green. Blue is the standard 3d6 bell curve for comparison.